LOW-β SC RF CAVITY INVESTIGATIONS
|
|
- Arthur Dawson
- 5 years ago
- Views:
Transcription
1 LOW-β SC RF CAVITY INVESTIGATIONS E. Zaplatin, W. Braeutigam, R. Stassen, FZJ, Juelich, Germany Abstract At present, many accelerators favour the use of SC cavities as accelerating RF structures. For some of them, like long pulse Spallation Source or Transmutation Facility SC structures might be the only option. For the high energy parts of such accelerators the welldeveloped multi-cell elliptic cavities are the most optimal. For the low energy part the elliptic structures cannot be used because of their mechanic characteristics. There is a scope of different already proven low-β SC cavities. Here we investigate so-called quarter-wave coaxial cavities (160 MHz, β=0.11 and 320MHz, β=0.22) and based on spoke cavity geometry multi-cell H-cavities (700 and 350 MHz, β= ). All cavities optimised to reach the maximal possible accelerating electric field. The results of electrodynamics and structural analysis are presented. Some conclusions on cavity mechanical stability are made. The simulations also have been done for various vacuum and coupling port positions. Different cavity tuning schemes are under investigation and compared results are presented. The comparison of numerical simulations with first experimental results of 700 MHz, β= gap H-cavity copper model measurements are shown. 1 QUARTER- AND HALF-WAVE CAVITIES Quarter-Wave RF Resonator (QWR) is a coaxial transmission line shortened by the terminating capacitance. The range of such structure application is for rather low β<0.2 and fundamental frequency under 300 MHz. The resonant frequency is defined by the line length, inner-outer radius ratio and capacitance. An accelerating field magnitude is limited by peak magnetic field that is defined mainly by the radius of the inner electrode. This favours the use of the cone QWR (Fig.1). The disadvantage of the cone cavity is larger longitudinal extension, which still can be compensated by the accelerating field increase (Table 1). Figure 1: Cone Quarter-Wave Resonator. The weak point of any QWR is its non-symmetry, which results in transversal components (especially magnetic) of RF field on the beam path. This can be eliminated by the half-wave coaxial cavity use. Table 1: Quarter- and Half Wave Cavity Parameters Cyl. QWR Cone QWR Cone HWR Freq. (MHz) β=v/c Rcav (cm) Rin.elec. cm) Lcav. (cm) R apper. (cm) Epk/Eacc Bpk/Eacc (mt/mv/m) SPOKE AND H-CAVITIES 2.1 Cavity Optimisation The spoke cavity (Fig.2)[1] by definition is a coaxial half-wave length cavity with an outer conductor turned on ninety degrees so that its axes is directed along the beam path. An equivalent capacitance of such cavity is defined by the distance between conductors in the centre of the cavity along this axe. The range of application of this cavity is from 100 to 800 MHz of fundamental frequency and β= The limitations of application are defined mainly by the resonance capacitance grow for low β values which in its turn reduces cavity diameter. Figure 2: Spoke & 10-Gap H-Cavities (700 MHz, β=0.2) To simplify the cryostat and control system design and to reduce the total accelerator length the multy-gap structure based on spoke cavity design is under consideration. Such structure could represent the same cylindrical or modified shape outer conductor as the cavity tank loaded with several electrodes (Fig.2). But as soon as one adds at least another spoke in such structure it turns from the coaxial spoke cavity into H-type cavity, which is defined by the electromagnetic field distribution. The detailed results of multy-gap H-cavity optimisation are published elsewhere[2]. Single gap simulations have provided the spoke shape optimisation with symmetry planes as the boundary conditions. This defines π-mode like accelerating field distribution along multy-gap structure. During simulations we supposed the spoke
2 manufacture by deforming the bulk Nb pipe, which means the spoke circumference in any cross section the same. Fig.3 presents the plots that used as the measures for optimisations. Co-dimensions of the spoke, accelerating gap and cavity tank size define the peak electric field. The optimum corresponds to the electric field homogeneous distribution on the spoke surface. Epk/Eacc zbar/zcell Bpk/Eacc mt/mv/m 8,4 8,2 8 7,8 7,6 7,4 7,2 7 6,8 5 0,3 0,35 5 0,5 0,55 zbar/zcell The results of the numerical simulations of such type structures are summarised in Table 2. For the cavities with higher β s we used scaled geometry configurations which resulted not in optimal cavity parameters. There is a possibility to use completely connected spoke bases getting the structure similar to a 4-vane RFQ cavity (Fig.5). To our mind it complicates much the cavity manufacture. The RF parameters and electric field distribution along cavity are similar to the previous structure. The radius of vane ends defines the limitation on magnetic field. This is a reason why the last spokes should be made with round bases. Figure 3: Spoke Geometry Optimisation In the single spoke (two gaps) cavity the most optimal spoke shape in the base region is the cylindrical crosssection. It is resulted from magnetic field distribution that surrounds an electrode. But the main limitation on B pk comes from the interaction with the cavity walls. To increase the space available for RF magnetic field we propose to make cavity tank square rather cylindrical (Fig.2). Another modification is related to the spoke geometry. In the H-type cavity the main magnetic flux distributes along the cavity length. That s why we suggest making spoke plane not only in the centre but also in the base parts. This brings not only again more space for h- field but mainly makes the distribution of the current on the spoke more homogeneous (Fig.4). Such modifications result in 25% reduction of B pk /E acc ratio. Figure 5: 10-Gap SCH with Bars (320 MHz, β=0.3) To create an even distribution of an electric field along the beam path we use additional volumes in the end parts of the cavity and decreased last accelerating gaps. This adds more space for magnetic field in this region, increases capacitance of gaps and as a result modifies e- field profile (Fig.6). Figure 6: Accelerating Field along Beam Path in 10-Gap H-Cavity Figure 4: H-Cavity Geometry Optimisation Table 2: SC H-Cavity Parameters Freq. (MHz) β=v/c Rcav (cm) Rapp. (cm) E pk /E acc B pk /E acc (mt/mv/m) df / MHz sch4g Figure 7: 4-gap H-cavity Geometry & Tuning Curve As a first step of an experimental SC H-cavity investigation we plan to build 4-gap 700 MHz, β=0.2
3 cavity (Fig.7). The main structure dimensions are kept like for 10-gap 700 MHz, β=0.2 cavity. The change in geometry has been made only for the end regions to have homogeneous electric field distribution along cavity axe. 2.2 Cavity Tune and Coupling For the cavity fine frequency tune the back walls of the structure can be used. The conjunction of these walls to the end electrodes is made round to give flexibility for their mechanic deformation. A frequency change is made by push-pulling this back planes. Electrically it means the last gap capacitance change and the possible frequency rangechangeisdefinedbythelastgapsize.here(fig.7) thetuningismadeonlyononesideofthecavity.the field profile changes within +30/-20% by +/-2 mm gap change. As an alternative option we consider an inductive tuner[3] which is installed in the end region at the maximum magnetic field (Fig.8). The possible frequency shiftisupto2.5mhz. positive point is a plane conjunction place for ports with walls. The second option (Fig.10) connection at the round cavity corners. The reason of this choice is to increase the efficiency of use the port holes to get the cavity wall treatment fluid out Gap H-Cavity Copper Model Figure 11: 10-gap H-cavity Copper Model Figure 8: 4-Gap SCH-Cavity with Inductive Plunger (geometry & magnetic field distribution) frequency / MHz SCH10g-model Frequency Tune 721 lef t 720,5 right maf ia , , , df / MHz SCH10g-model FrequencyTune 0-1,5-1 -0,5-0 0,5 1 1,5 - - left - right -1 mafia -1,2 Figure 12: Resonance frequency & frequency shift vs. last accelerating gap change Figure 9: 4-Gap SCH-Cavity with Coupling Ports (geometry & magnetic field distribution) The simulations for the field profile and cavity tuning have been made with MAFIA codes for ¼ part of geometry with around 2.5M mesh points. 1,0 0,9 Ez / Ez0 1,0 0,9 0,7 0,5 0,3 0,1 0,0 Accelerating Field along Beam Path RF Measuremets M AFIA Sim ulation ddd=.000 ddd= ,00 0,05 0,10 0, z/m ddd=.000 ddd=-.001 Figure 10: 4-Gap SCH-Cavity with Coupling Ports turned on 45 o (magnetic field distribution) E/E_max 0,7 0,5 0,3 0,1 0, Two possible places for vacuum and coupling ports are considered. First (Fig.9) is the plane side cavity wall, which has an advantage that the vacuum port is situated in the centre of the cavity with a minimal RF electromagnetic field. At the same time the power coupling and probe ports are close to the maximal RF magnetic field which makes the coupling easy. Another Figure 13: Electric Field Distribution along Beam Path (simulation & measurements) For 3D numerical simulation verification and cavity tuning investigation 10-gap H-cavity copper model (700 MHz, β=0.2) has been built (Fig.11). The cavity and end
4 plates are made from the 3 mm and 1 mm copper sheet respectively. The spokes have been machined from the bulk copper. For the cavity tune the deformation of the end plates is used. The results of the numerical simulations and first model measurements are shown on Figs STRUCTURAL ANALYSIS The structural analysis of SC H-cavity has been made to find the model predictions for peak stresses, deflections and flange reaction forces under vacuum loads and room temperature, and also for forces required to produce a specify tuning deflection. The important part of simulations is devoted to the determination of resonant structural frequencies. The whole H-cavity is supposed to be produced out of niobium sheets. The following parameters of niobium are used: Young s modulus E= N/mm 2, Density ρ=8.57 g/cm 3, Poisson number ν=0.38. The Young s modulus of niobium is in the wide temperature range invariable, also in the range of the cryo-temperatures. We use yield strength 500 as a reference measure[4] in our calculations. The simulations have been made with ANSYS codes. Figure 14: 10-gap H-cavity Tuning Simulation (deformations, force application, von Mises stress) 3.1 Tuning and Vacuum Pressure To allow the cavity tuning by the end plate deformation it should be flexible enough and at the same time rather rigid to keep an extra pressure from the helium volume and cool-down stress. The end electrode shift for tuning should be in the range of +/-2 mm (which is defined by cavity cross section size) that makes about +/-0.5 MHz frequency shift for 320 MHz, β= gap cavity. For 700 MHz, β=0.2 cavities it is much better (Figs.7,12). The required forces for such deformations are 65.6 kn (10-gaps, 700 MHz, β=0.2) and kn (10-gaps, 320 MHz, β=0.3). No any other serious deformations detected in the cavity shape (Fig.14). In the analysis of the cavities under vacuum loading conditions all structure surfaces are under 1 atm extra atmospheric pressure including the surfaces of spokes as they are supposed to be filled with a liquid helium. Table 3: Deformations Caused by Extra Pressure in 10- Gap H-cavities End Plate: Wall thickness 1 mm Max deformation 0.5e-6 m Max stress von Mises 0.35 Walls (No Stiffening Ribs): Max deformation 1.9e-5 m Max stress von Mises 9.9 Walls (Stiffening Ribs): Ribs 1cm high, 2 mm thick Max deformation 8.3e-6 m Max stress von Mises 9.3 End Plate: Wall thickness 1 mm Max deformation 0.8e-4 m Max stress von Mises 10.3 Walls (No Stiffening Ribs): Wall thickness 3 mm Max deformation 1.6e-3 m Max stress von Mises 193 Walls (Stiffening Ribs): Ribs 2cm high, 5 mm thick Max deformation 0.2e-3 m Max stress von Mises 120 For comparison we calculated the cavities with longitudinal ribs welded along two structure sides with maximal predicted deformations (Table 4). The 700 MHz, β=0.2 cavity because of its small dimensions is able to work without stiffening. The 320 MHz, β=0.3 cavity needs stiffening but on the other hand the single rib per cavity side going direct through the spoke-wall contact places may not be practical in terms of cavity manufacture. In this case we simulated two ribs per cavity side. The results are about in the same range. The highest stresses are always at spoke-wall joints. 3.2 Cool-Down The cavity is supposed to be assembled at room temperature and then cooled to 2-4 K in a fluid helium bath. As the cool gas and liquid enter through the vent pipe at the top of the helium vessel, localized cooling occurs for components directly in line with the coolant flow. The localised cooling results in thermal and stress gradients. As a start up we investigate cavity geometry displacements and loads under temperature gradient and steady-state cool-down conditions. More accurate and full calculations have to be made during cavity-helium vessel assembly design. Here we limit ourselves by the case of cavity degree of freedom with both beam pipes and tuning plates at their external circumference are fixed. In the real
5 design some addition suspensions like vacuum and coupling ports will make the structure even more rigid. To simulate the transient cooling of the cavity the bottom side was cooled to 2 K, while the rest remained at 293 K. Fig.15 shows deformed geometry without additional pressure applied. The transient case tends to shrink the cavity bottom causing the maximal stress in the spoke-wall joints. The stresses in the cavity well below thedesignallowable.insteady-statecasethewholecavity is under 2-4 K operating temperature. Transient Cooling: Max Displacement (mm) Max Stress von Mises 431 (Pa) Steady-State Cooling: Max Displacement (mm) Max Stress von Mises 633 (Pa) Figure 15: Cool-Down Simulations of 4-gap H-cavity (700 MHz, β=0.2) As a final simulation we investigated combined case with cool-down, vacuum pressure and tuning altogether. The results are summarised in Table 4. Table 4: Cavity Structural Analysis with Cool-Down, Vacuum Pressure and Tuning (SCH ). Tuning -2 mm +2 mm Tuning Pressure kn kn Max Displacement -2.6 mm +2 mm Von Mises Stress Modal Analysis Table 5. Modal Analysis Results of Frequency / Hz Frequency / Hz Frequency / Hz walls 2/1 walls 2/1 walls 3/ The main purpose of these simulations is to find weak points of the cavity in terms of dynamic behaviour to make subsequently design of a most optimal rigid outer containment. The boundary conditions (constrains) for all our models are the both beam pipe ends completely blocked against displacements in any direction (by tuner or continuos beam pipe). Additionally, in 10-gap cavity calculations we fixed also the outer cavity tank at one side. In a real cavity design together with cryostat most probably both cavity ends will be fixed. In the future, more accurate and detailed calculations with a real cryostat design should be provided. The following simulations show the first results, which give a representation about mechanical stability of such cavities (Tables 5-7). Detailed results one can find elsewhere[5]. Table 6. Modal Analysis Results of 4-Gap H-Cavity SCH Frequency / Hz Frequency / Hz walls 2/1 walls 3/ Table 7. Modal Analysis Results of both cavity ends fixed Freq / Hz Freq / Hz Freq / Hz Freq / Hz walls 2/1 walls 3/1 walls 3/1 + rib/side walls 3/1 + 2 ribs/side REFERENCES [1] J.R. Delayen et al., "Design and Test of a Superconducting Structure for High-Velocity Ions", LINAC'92, Ottawa, [2] E.N. Zaplatin, "A Spoke RF Cavity Simulation with MAFIA", RFSC 99, Santa Fe, [3] Yu. Senichev, T. Korsbjerg, S.P. Moeller, E. Zaplatin, "Solving the Problem of Heating of RF Contacts in Cavity Tuners", Pac 97, Vancouver, [4] R.P. Walsh et al., "Low Temperature Tensile and Fracture Toughness Properties of SCRF Cavity Structural Material ", SCRF 99, Santa Fe, [5] E.N. Zaplatin, "Electrodynamics and Mechanical Features of H-Type Superconducting Structures for Low Energy Part of ESS Linac", ESS L, Juelich, 2001.
CONICAL HALF-WAVE RESONATOR INVESTIGATIONS
CONICAL HALF-WAVE RESONATOR INVESTIGATIONS E. Zaplatin, Forschungszentrum Juelich, Germany Abstract In the low energy part of accelerators the magnets usually alternate accelerating cavities. For these
More informationDEVELOPMENT OF A BETA 0.12, 88 MHZ, QUARTER WAVE RESONATOR AND ITS CRYOMODULE FOR THE SPIRAL2 PROJECT
DEVELOPMENT OF A BETA 0.12, 88 MHZ, QUARTER WAVE RESONATOR AND ITS CRYOMODULE FOR THE SPIRAL2 PROJECT G. Olry, J-L. Biarrotte, S. Blivet, S. Bousson, C. Commeaux, C. Joly, T. Junquera, J. Lesrel, E. Roy,
More informationQUARTER WAVE COAXIAL LINE CAVITY FOR NEW DELHI LINAC BOOSTER*
QUARTER WAVE COAXIAL LINE CAVITY FOR NEW DELHI LINAC BOOSTER* P.N. Prakash and A.Roy Nuclear Science Centre, P.O.Box 10502, New Delhi 110 067, INDIA and K.W.Shepard Physics Division, Argonne National Laboratory,
More informationDESIGN STUDY OF A 176 MHZ SRF HALF WAVE RESONATOR FOR THE SPIRAL-2 PROJECT
DESIGN STUDY OF A 176 MHZ SRF HALF WAVE RESONATOR FOR THE SPIRAL-2 PROJECT J-L. Biarrotte*, S. Blivet, S. Bousson, T. Junquera, G. Olry, H. Saugnac CNRS / IN2P3 / IPN Orsay, France Abstract In November
More informationDesign of ESS-Bilbao RFQ Linear Accelerator
Design of ESS-Bilbao RFQ Linear Accelerator J.L. Muñoz 1*, D. de Cos 1, I. Madariaga 1 and I. Bustinduy 1 1 ESS-Bilbao *Corresponding author: Ugaldeguren III, Polígono A - 7 B, 48170 Zamudio SPAIN, jlmunoz@essbilbao.org
More informationDesign of the 352MHz, beta 0.50, Double- Spoke Cavity for ESS
Design of the 352MHz, beta 0.50, Double- Spoke Cavity for ESS Patricia DUCHESNE, Guillaume OLRY Sylvain BRAULT, Sébastien BOUSSON, Patxi DUTHIL, Denis REYNET Institut de Physique Nucléaire d Orsay SRF
More informationThe Superconducting Radio Frequency Quadrupole Structures Review
The Superconducting Radio Frequency Quadrupole Structures Review Augusto Lombardi INFN- Laboratori Nazionali di Legnaro, via Romea 4 I-35020 Legnaro (PD) Abstract Since 1985 the idea of using the fast
More informationProject X Cavity RF and mechanical design. T. Khabiboulline, FNAL/TD/SRF
Project X Cavity RF and mechanical design T. Khabiboulline, FNAL/TD/SRF TTC meeting on CW-SRF, 2013 Project X Cavity RF and mechanical design T 1 High ß Low ß 0.5 HWR SSR1 SSR2 0 1 10 100 1 10 3 1 10 4
More informationA 3 GHz SRF reduced-β Cavity for the S-DALINAC
A 3 GHz SRF reduced-β Cavity for the S-DALINAC D. Bazyl*, W.F.O. Müller, H. De Gersem Gefördert durch die DFG im Rahmen des GRK 2128 20.11.2018 M.Sc. Dmitry Bazyl TU Darmstadt TEMF Upgrade of the Capture
More informationFrequency Tuning and RF Systems for the ATLAS Energy Upgrade. Gary P. Zinkann
Frequency Tuning and RF Systems for the ATLAS Energy Upgrade Outline Overview of the ATLAS Energy Upgrade Description of cavity Tuning method used during cavity construction Description and test results
More informationProgresses on China ADS Superconducting Cavities
Progresses on China ADS Superconducting Cavities Peng Sha IHEP, CAS 2013/06/12 1 Outline 1. Introduction 2. Spoke012 cavity 3. Spoke021 cavity 4. Spoke040 cavity 5. 650MHz β=0.82 5-cell cavity 6. High
More informationCST MWS simulation of the SARAF RFQ 1.5 MeV/nucleon proton/deuteron accelerator
CST MWS simulation of the SARAF RFQ 1.5 MeV/nucleon proton/deuteron accelerator Jacob Rodnizki SARAF Soreq NRC APril 19-21 th, 2010 Outline 1. SARAF accelerator 2. Presentation of the four rods RFQ 3.
More informationSC Cavity Development at IMP. Linac Group Institute of Modern Physics, CAS IHEP, Beijing,CHINA
SC Cavity Development at IMP Linac Group Institute of Modern Physics, CAS 2011-09-19 IHEP, Beijing,CHINA Outline Ø Superconducting Cavity Choice Ø HWR Cavity Design EM Design & optimization Mechanical
More informationSRF Advances for ATLAS and Other β<1 Applications
SRF Advances for ATLAS and Other β
More informationDESIGN OF SINGLE SPOKE RESONATORS FOR PROJECT X*
DESIGN OF SINGLE SPOKE RESONATORS FOR PROJECT X * L. Ristori, S. Barbanotti, P. Berrutti, M. Champion, M. Foley, C. Ginsburg, I. Gonin, C. Grimm, T. Khabiboulline, D. Passarelli, N. Solyak, A. Vo ostrikov,
More informationDESIGN AND BEAM DYNAMICS STUDIES OF A MULTI-ION LINAC INJECTOR FOR THE JLEIC ION COMPLEX
DESIGN AND BEAM DYNAMICS STUDIES OF A MULTI-ION LINAC INJECTOR FOR THE JLEIC ION COMPLEX Speaker: P.N. Ostroumov Contributors: A. Plastun, B. Mustapha and Z. Conway HB2016, July 7, 2016, Malmö, Sweden
More informationTHE MULTIPACTING STUDY OF NIOBIUM SPUTTERED HIGH-BETA QUARTER-WAVE RESONATORS FOR HIE-ISOLDE
THE MULTIPACTING STUDY OF NIOBIUM SPUTTERED HIGH-BETA QUARTER-WAVE RESONATORS FOR HIE-ISOLDE P. Zhang and W. Venturini Delsolaro CERN, Geneva, Switzerland Abstract Superconducting Quarter-Wave Resonators
More informationLORENTZ FORCE DETUNING ANALYSIS OF THE SPALLATION NEUTRON SOURCE (SNS) ACCELERATING CAVITIES *
LORENTZ FORCE DETUNING ANALYSIS OF THE SPALLATION NEUTRON SOURCE (SNS) ACCELERATING CAVITIES * R. Mitchell, K. Matsumoto, Los Alamos National Lab, Los Alamos, NM 87545, USA G. Ciovati, K. Davis, K. Macha,
More informationDevelopment of Superconducting CH-Cavities for the EUROTRANS and IFMIF Project 1
1 AT/P5-01-POSTER Development of Superconducting CH-Cavities for the EUROTRANS and IFMIF Project 1 F. Dziuba 2, H. Podlech 2, M. Buh 2, U. Ratzinger 2, A. Bechtold 3, H. Klein 2 2 Institute for Applied
More informationThe design of a radio frequency quadrupole LINAC for the RIB project at VECC Kolkata
PRAMANA cfl Indian Academy of Sciences Vol. 59, No. 6 journal of December 2002 physics pp. 957 962 The design of a radio frequency quadrupole LINAC for the RIB project at VECC Kolkata V BANERJEE 1;Λ, ALOK
More informationStructures for RIA and FNAL Proton Driver
Structures for RIA and FNAL Proton Driver Speaker: Mike Kelly 12 th International Workshop on RF Superconductivity July 11-15, 2005 Argonne National Laboratory A Laboratory Operated by The University of
More informationTuning systems for superconducting cavities at Saclay
Tuning systems for superconducting cavities at Saclay 1 MACSE: 1990: tuner in LHe bath at 1.8K TTF: 1995 tuner at 1.8K in the insulating vacuum SOLEIL: 1999 tuner at 4 K in the insulating vacuum Super-3HC:
More informationMechanical study of the «Saclay piezo tuner» PTS (Piezo Tuning System) P. Bosland, Bo Wu DAPNIA - CEA Saclay. Abstract
SRF Mechanical study of the «Saclay piezo tuner» PTS (Piezo Tuning System) P. Bosland, Bo Wu DAPNIA - CEA Saclay Abstract This report presents the piezo tuner developed at Saclay in the framework of CARE/SRF.
More informationCAGE CAVITY: A LOW COST, HIGH PERFORMANCE SRF ACCELERATING STRUCTURE*
CAGE CAVITY: A LOW COST, HIGH PERFORMANCE SRF ACCELERATING STRUCTURE* J. Noonan, T.L. Smith, M. Virgo, G.J. Waldsmidt, Argonne National Laboratory J.W. Lewellen, Los Alamos National Laboratory Abstract
More informationElectromagnetic, Thermal and Structural Analysis of the LUX Photoinjector Cavity using ANSYS. Steve Virostek Lawrence Berkeley National Lab
Electromagnetic, Thermal and Structural Analysis of the LUX Photoinjector Cavity using ANSYS Steve Virostek Lawrence Berkeley National Lab 13 December 2004 Photoinjector Background The proposed LBNL LUX
More informationSUPERCONDUCTING PROTOTYPE CAVITIES FOR THE SPALLATION NEUTRON SOURCE (SNS) PROJECT *
SUPERCONDUCTING PROTOTYPE CAVITIES FOR THE SPALLATION NEUTRON SOURCE (SNS) PROJECT * G. Ciovati, P. Kneisel, J. Brawley, R. Bundy, I. Campisi, K. Davis, K. Macha, D. Machie, J. Mammosser, S. Morgan, R.
More informationCavity development for TESLA
Cavity development for TESLA Lutz.Lilje@desy.de DESY -FDET- Cavity basics History: Limitations and solutions»material inclusions»weld defects»field emission»increased surface resistance at high field Performance
More informationThird Harmonic Cavity Status
Third Harmonic Cavity Status General parameters Cavity design Main coupler calculation HOM analysis and HOM coupler design Lorentz Forces and Stress analysis Summary General parameters Third harmonic cavity
More informationHIGH POWER INPUT COUPLERS FOR THE STF BASELINE CAVITY SYSTEM AT KEK
HIGH POWER INPUT COUPLERS FOR THE STF BASELINE CAVITY SYSTEM AT KEK E. Kako #, H. Hayano, S. Noguchi, T. Shishido, K. Watanabe and Y. Yamamoto KEK, Tsukuba, Ibaraki, 305-0801, Japan Abstract An input coupler,
More informationTESLA RF POWER COUPLERS DEVELOPMENT AT DESY.
TESLA RF POWER COUPLERS DEVELOPMENT AT DESY. Dwersteg B., Kostin D., Lalayan M., Martens C., Möller W.-D., DESY, D-22603 Hamburg, Germany. Abstract Different RF power couplers for the TESLA Test Facility
More informationEvaluation of HOM Coupler Probe Heating by HFSS Simulation
G. Wu, H. Wang, R. A. Rimmer, C. E. Reece Abstract: Three different tip geometries in a HOM coupler on a CEBAF Upgrade Low Loss cavity have been evaluated by HFSS simulation to understand the tip surface
More informationHIGH POWER COUPLER FOR THE TESLA TEST FACILITY
Abstract HIGH POWER COUPLER FOR THE TESLA TEST FACILITY W.-D. Moeller * for the TESLA Collaboration, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany The TeV Energy Superconducting Linear
More informationCOUPLER DESIGN CONSIDERATIONS FOR THE ILC CRAB CAVITY
COUPLER DESIGN CONSIDERATIONS FOR THE ILC CRAB CAVITY C. Beard 1), G. Burt 2), A. C. Dexter 2), P. Goudket 1), P. A. McIntosh 1), E. Wooldridge 1) 1) ASTeC, Daresbury laboratory, Warrington, Cheshire,
More informationRF STATUS OF SUPERCONDUCTING MODULE DEVELOPMENT SUITABLE FOR CW OPERATION: ELBE CRYOSTATS
RF STATUS OF SUPERCONDUCTING MODULE DEVELOPMENT SUITABLE FOR CW OPERATION: ELBE CRYOSTATS J. Teichert, A. Büchner, H. Büttig, F. Gabriel, P. Michel, K. Möller, U. Lehnert, Ch. Schneider, J. Stephan, A.
More informationExamination of Microphonic Effects in SRF Cavities
Examination of Microphonic Effects in SRF Cavities Christina Leidel Department of Physics, Ohio Northern University, Ada, OH, 45810 (Dated: August 13, 2004) Superconducting RF cavities in Cornell s proposed
More informationCoupler Electromagnetic Design
Coupler Electromagnetic Design HPC Workshop, TJNAF October 30 November 1, 2002 Yoon Kang Spallation Neutron Source Oak Ridge National Laboratory Contents Fundamental Power Coupler Design Consideration
More informationA Design Study of a 100-MHz Thermionic RF Gun for the ANL XFEL-O Injector
A Design Study of a 100-MHz Thermionic RF Gun for the ANL XFEL-O Injector A. Nassiri Advanced Photon Source For ANL XFEL-O Injector Study Group M. Borland (ASD), B. Brajuskovic (AES), D. Capatina (AES),
More informationMagnetron. Physical construction of a magnetron
anode block interaction space cathode filament leads Magnetron The magnetron is a high-powered vacuum tube that works as self-excited microwave oscillator. Crossed electron and magnetic fields are used
More informationS. Ghosh On behalf of Linac, IFR, Cryogenics, RF and beam transport group members. Inter University Accelerator Centre New Delhi India
S. Ghosh On behalf of Linac, IFR, Cryogenics, RF and beam transport group members Inter University Accelerator Centre New Delhi 110067 India Highlights of presentation 1. Introduction to Linear accelerator
More informationSuperconducting RF Cavity Performance Degradation after Quenching in Static Magnetic Field
Superconducting RF Cavity Performance Degradation after Quenching in Static Magnetic Field T. Khabiboulline, D. Sergatskov, I. Terechkine* Fermi National Accelerator Laboratory (FNAL) *MS-316, P.O. Box
More informationHIGH POWER PULSED TESTS OF A BETA=0.5 5-CELL 704 MHZ SUPERCONDUCTING CAVITY
HIGH POWER PULSED TESTS OF A BETA=0.5 5-CELL 704 MHZ SUPERCONDUCTING CAVITY G. Devanz, D. Braud, M. Desmons, Y. Gasser, E. Jacques, O. Piquet, J. Plouin, J.- P. Poupeau, D. Roudier, P. Sahuquet, CEA-Saclay,
More informationSuperconducting RF cavities activities for the MAX project
1 Superconducting RF cavities activities for the MAX project OECD-NEA TCADS-2 Workshop Nantes, 22 May 2013 Marouan El Yakoubi, CNRS / IPNO 2 Contents 352 MHz spoke Cryomodule design 700 MHz test area 700
More informationHigh Power Couplers for TTF - FEL
High Power Couplers for TTF - FEL 1. Requirements for High Power Couplers on superconducting Cavities 2. Characteristics of pulsed couplers 3. Standing wave pattern in the coaxial coupler line 4. Advantages
More informationQWR Nb sputtering. Anna Maria Porcellato. MoP04. S. Stark, F. Stivanello, V. Palmieri INFN Laboratori Nazionali di Legnaro
QWR Nb sputtering MoP04 Anna Maria Porcellato S. Stark, F. Stivanello, V. Palmieri INFN Laboratori Nazionali di Legnaro 12 International Workshop on RF Superconductivity, Ithaca, 08-15/07/2005 SC Quarter
More informationThird Harmonic Superconducting passive cavities in ELETTRA and SLS
RF superconductivity application to synchrotron radiation light sources Third Harmonic Superconducting passive cavities in ELETTRA and SLS 2 cryomodules (one per machine) with 2 Nb/Cu cavities at 1.5 GHz
More informationA New 2 K Superconducting Half-Wave Cavity Cryomodule for PIP-II
A New 2 K Superconducting Half-Wave Cavity Cryomodule for PIP-II Zachary Conway On Behalf of the ANL Physics Division Linac Development Group June 29, 2015 Acknowledgements People Working at ANL: PHY:
More informationDEVELOPMENT OF ROOM TEMPERATURE AND SUPERCONDUCTING CH-STRUCTURES H. Podlech IAP, Universität Frankfurt/Main, Germany. Abstract
EU contract number RII3-CT-2003-506395 CARE Conf-04-011-HIPPI DEVELOPMENT OF ROOM TEMPERATURE AND SUPERCONDUCTING CH-STRUCTURES H. Podlech IAP, Universität Frankfurt/Main, Germany Abstract Abstract In
More informationLOW BETA CAVITY DEVELOPMENT FOR AN ATLAS INTENSITY UPGRADE
LOW BETA CAVITY DEVELOPMENT FOR AN ATLAS INTENSITY UPGRADE M. P. Kelly, Z. A. Conway, S. M. Gerbick, M. Kedzie, T. C. Reid, R. C. Murphy, B. Mustapha, S.H. Kim, P. N. Ostroumov, Argonne National Laboratory,
More informationThe European Spallation Source. Dave McGinnis Chief Engineer ESS\Accelerator Division IVEC 2013
The European Spallation Source Dave McGinnis Chief Engineer ESS\Accelerator Division IVEC 2013 Overview The European Spallation Source (ESS) will house the most powerful proton linac ever built. The average
More informationTESTS AND DESIGNS OF HIGH-POWER WAVEGUIDE VACUUM WINDOWS AT CORNELL
TESTS AND DESIGNS OF HIGH-POWER WAVEGUIDE VACUUM WINDOWS AT CORNELL E. Chojnacki, P. Barnes, S. Belomestnykh, R. Kaplan, J. Kirchgessner, H. Padamsee, P. Quigley, J. Reilly, and J. Sears CORNELL UNIVERSITY,
More informationStatus of the superconducting cavity development at RISP. Gunn Tae Park Accelerator division, RISP May 9th. 2014
Status of the superconducting cavity development at RISP. Gunn Tae Park Accelerator division, RISP May 9th. 2014 Contents 1. Introduction 2. Design 3. Fabrication 1. Introduction What is the accelerator?
More informationBeam Position Monitoring System In Accelerators
Beam Position Monitoring System In Accelerators Department of Electrical and Information Technology Lund University & European Spallation source Lund, Sweden Elham Vafa Rouhina Behpour Supervisors: Anders
More informationRaja Ramanna Center for Advanced Technology, Indore, India
Electromagnetic Design of g = 0.9, 650 MHz Superconducting Radiofrequency Cavity Arup Ratan Jana 1, Vinit Kumar 1, Abhay Kumar 2 and Rahul Gaur 1 1 Materials and Advanced Accelerator Science Division 2
More informationCouplers for Project X. S. Kazakov, T. Khabiboulline
Couplers for Project X S. Kazakov, T. Khabiboulline TTC meeting on CW-SRF, 2013 Requirements to Project X couplers Cavity SSR1 (325MHz): Cavity SSR2 (325MHz): Max. energy gain - 2.1 MV, Max. power, 1 ma
More informationDesign, Development and Testing of RF Window for C band 250 kw CW Power Klystron
Available online www.ejaet.com European Journal of Advances in Engineering and Technology, 2016, 3(6): 26-30 Research Article ISSN: 2394-658X Design, Development and Testing of RF Window for C band 250
More informationADVANCES IN CW ION LINACS*
Abstract Substantial research and development related to continuous wave (CW) proton and ion accelerators is being performed at ANL. A 4-meter long 60.625-MHz normal conducting (NC) CW radio frequency
More informationPresent and future beams for SHE research at GSI W. Barth, GSI - Darmstadt
Present and future beams for SHE research at GSI W. Barth, GSI - Darmstadt 1. Heavy Ion Linear Accelerator UNILAC 2. GSI Accelerator Facility Injector for FAIR 3. Status Quo of the UNILAC-performance 4.
More informationRF thermal and new cold part design studies on TTF-III input coupler for Project-X
RF thermal and new cold part design studies on TTF-III input coupler for Project-X PEI Shilun( 裴士伦 ) 1; 1) Chris E Adolphsen 2 LI Zenghai( 李增海 ) 2 Nikolay A Solyak 3 Ivan V Gonin 3 1 Institute of High
More informationLow-beta Structures. Maurizio Vretenar CERN BE/RF CAS RF Ebeltoft 2010
Low-beta Structures Maurizio Vretenar CERN BE/RF CAS RF Ebeltoft. Low-beta: problems and solutions. Coupled-cell accelerating structures 3. Overview and comparison of low-beta structures 4. The Radio Frequency
More information3.9 GHz work at Fermilab
3.9 GHz work at Fermilab + CKM 13-cell cavity Engineering and designing W.-D. Moeller Desy, MHF-sl Protocol of the meeting about 3 rd harmonic cavities during the TESLA collaboration meeting at DESY on
More informationAmit Roy Director, IUAC
SUPERCONDUCTING RF DEVELOPMENT AT INTER-UNIVERSITY ACCELERATOR CENTRE (IUAC) (JOINT PROPOSAL FROM IUAC & Delhi University (DU)) Amit Roy Director, IUAC to be presented by Kirti Ranjan (DU / Fermilab) Overview
More informationENGINEERING AND BUILDING RF STRUCTURES THE WORKS *
ENGINEERING AND BUILDING RF STRUCTURES THE WORKS * Dale L. Schrage Los Alamos National Laboratory, Los Alamos, NM, USA, 87545 Abstract The translation of the physics designs of linear accelerators into
More informationA Study of Magnetic Shielding Performance of a Fermilab International Linear Collider Superconducting RF Cavity Cryomodule
A Study of Magnetic Shielding Performance of a Fermilab International Linear Collider Superconducting RF Cavity Cryomodule Anthony C. Crawford Fermilab Technical Div. / SRF Development Dept. acc52@fnal.gov
More informationNew Tracking Gantry-Synchrotron Idea. G H Rees, ASTeC, RAL, U.K,
New Tracking Gantry-Synchrotron Idea G H Rees, ASTeC, RAL, U.K, Scheme makes use of the following: simple synchrotron and gantry magnet lattices series connection of magnets for 5 Hz tracking one main
More informationPERFORMANCE OF THE TUNER MECHANISM FOR SSR1 RESONATORS DURING FULLY INTEGRETED TESTS AT FERMILAB
PERFORMANCE OF THE TUNER MECHANISM FOR SSR1 RESONATORS DURING FULLY INTEGRETED TESTS AT FERMILAB D. Passarelli, J.P. Holzbauer, L. Ristori, FNAL, Batavia, IL 651, USA Abstract In the framework of the Proton
More informationCompletion of the first SSR1 cavity for PXIE
2013 North American Particle Accelerator Conference Pasadena, CA Completion of the first SSR1 cavity for PXIE Design, Manufacturing and Qualification Leonardo Ristori on behalf of the Fermilab SRF Development
More informationPhysical Design of Superconducting Magnet for ADS Injection I
Submitted to Chinese Physics C' Physical Design of Superconducting Magnet for ADS Injection I PENG Quan-ling( 彭全岭 ), WANG Bing( 王冰 ), CHEN Yuan( 陈沅 ) YANG Xiang-chen( 杨向臣 ) Institute of High Energy Physics,
More informationDesign Topics for Superconducting RF Cavities and Ancillaries
Design Topics for Superconducting RF Cavities and Ancillaries H. Padamsee 1 Cornell University, CLASSE, Ithaca, New York Abstract RF superconductivity has become a major subfield of accelerator science.
More informationLow- and Intermediate-β Cavity Design
Low- and Intermediate-β Cavity Design Tutorial introduction to superconducting resonators for acceleration of ion beams with β
More informationTo produce more powerful and high-efficiency particle accelerator, efforts have
Measuring Unloaded Quality Factor of Superconducting RF Cryomodule Jian Cong Zeng Department of Physics and Astronomy, State University of New York at Geneseo, Geneseo, NY 14454 Elvin Harms, Jr. Accelerator
More informationMuCool Test Area Experimental Program Summary
MuCool Test Area Experimental Program Summary Alexey Kochemirovskiy The University of Chicago/Fermilab Alexey Kochemirovskiy NuFact'16 (Quy Nhon, August 21-27, 2016) Outline Introduction Motivation MTA
More informationJUAS 2018 LINACS. Jean-Baptiste Lallement, Veliko Dimov BE/ABP CERN.
LINACS Jean-Baptiste Lallement, Veliko Dimov BE/ABP CERN jean-baptiste.lallement@cern.ch http://jlalleme.web.cern.ch/jlalleme/juas2018/ Credits Much material is taken from: Thomas Wangler, RF linear accelerators
More informationREVIEW ON SUPERCONDUCTING RF GUNS
REVIEW ON SUPERCONDUCTING RF GUNS D. Janssen #, A. Arnold, H. Büttig, U. Lehnert, P. Michel, P. Murcek, C. Schneider, R. Schurig, F. Staufenbiel, J. Teichert, R. Xiang, Forschungszentrum Rossendorf, Germany.
More informationTHE TUNING SYSTEM FOR THE HIE-ISOLDE HIGH-BETA QUARTER WAVE RESONATOR
THE TUNING SYSTEM FOR THE HIE-ISOLDE HIGH-BETA QUARTER WAVE RESONATOR P. Zhang 1,, L. Alberty 1, L. Arnaudon 1, K. Artoos 1, S. Calatroni 1, O. Capatina 1, A. D Elia 1,2,3, Y. Kadi 1, I. Mondino 1, T.
More informationAdvances in CW Ion Linacs
IPAC 2015 P.N. Ostroumov May 8, 2015 Content Two types of CW ion linacs Example of a normal conducting CW RFQ Cryomodule design and performance High performance quarter wave and half wave SC resonators
More informationCHAPTER 2 ELECTROMAGNETIC FORCE AND DEFORMATION
18 CHAPTER 2 ELECTROMAGNETIC FORCE AND DEFORMATION 2.1 INTRODUCTION Transformers are subjected to a variety of electrical, mechanical and thermal stresses during normal life time and they fail when these
More informationPI piezo Life Time Test Report. A. Bosotti, R. Paparella, F. Puricelli
PI piezo Life Time Test Report A. Bosotti, R. Paparella, F. Puricelli 1. Introduction...3 1.1. Vacuum...4 1.2. Temperature...4 1.3. Preload...4 1.4. Driving signal...4 2. General features and conceptual
More informationPlasma Confinement by Pressure of Rotating Magnetic Field in Toroidal Device
1 ICC/P5-41 Plasma Confinement by Pressure of Rotating Magnetic Field in Toroidal Device V. Svidzinski 1 1 FAR-TECH, Inc., San Diego, USA Corresponding Author: svidzinski@far-tech.com Abstract: Plasma
More informationMULTIPACTING IN THE CRAB CAVITY
MULTIPACTING IN TH CRAB CAVITY Y. Morita, K. Hara, K. Hosoyama, A. Kabe, Y. Kojima, H. Nakai, KK, 1-1, Oho, Tsukuba, Ibaraki 3-81, JAPAN Md. M. Rahman, K. Nakanishi, Graduate University for Advanced Studies,
More informationNormal-Conducting Photoinjector for High Power CW FEL
LA-UR-04-5617,-5808 www.arxiv.org: physics/0404109 Normal-Conducting Photoinjector for High Power CW FEL Sergey Kurennoy, LANL, Los Alamos, NM, USA An RF photoinjector capable of producing high continuous
More informationRecent Progress in the Superconducting RF Program at TRIUMF/ISAC
Recent Progress in the Superconducting RF Program at TRIUMF/ISAC Abstract R.E. Laxdal, K. Fong, M. Laverty, A. Mitra, R. Poirier, I. Sekachev, V. Zvyagintsev, TRIUMF, Vancouver, BC, V6T2A3, Canada A heavy
More informationTHE CRYOGENIC SYSTEM OF TESLA
THE CRYOGENIC SYSTEM OF TESLA S. Wolff, DESY, Notkestr. 85, 22607 Hamburg, Germany for the TESLA collaboration Abstract TESLA, a 33 km long 500 GeV centre-of-mass energy superconducting linear collider
More informationDesign and RF Measurements of an X-band Accelerating Structure for the Sparc Project
Design and RF Measurements of an X-band Accelerating Structure for the Sparc Project INFN-LNF ; UNIVERSITY OF ROME LA SAPIENZA ; INFN - MI Presented by BRUNO SPATARO Erice, Sicily, October 9-14; 2005 SALAF
More informationREVIEW OF HIGH POWER CW COUPLERS FOR SC CAVITIES. S. Belomestnykh
REVIEW OF HIGH POWER CW COUPLERS FOR SC CAVITIES S. Belomestnykh HPC workshop JLAB, 30 October 2002 Introduction Many aspects of the high-power coupler design, fabrication, preparation, conditioning, integration
More informationSingle-turn and multi-turn coil domains in 3D COMSOL. All rights reserved.
Single-turn and multi-turn coil domains in 3D 2012 COMSOL. All rights reserved. Introduction This tutorial shows how to use the Single-Turn Coil Domain and Multi-Turn Coil Domain features in COMSOL s Magnetic
More informationPROGRESS IN IFMIF HALF WAVE RESONATORS MANUFACTURING AND TEST PREPARATION
PROGRESS IN IFMIF HALF WAVE RESONATORS MANUFACTURING AND TEST PREPARATION G. Devanz, N. Bazin, G. Disset, H. Dzitko, P. Hardy, H. Jenhani, J. Neyret, O. Piquet, J. Plouin, N. Selami, CEA-Saclay, France
More informationBeam Loss Monitoring (BLM) System for ESS
Beam Loss Monitoring (BLM) System for ESS Lali Tchelidze European Spallation Source ESS AB lali.tchelidze@esss.se March 2, 2011 Outline 1. BLM Types; 2. BLM Positioning and Calibration; 3. BLMs as part
More informationSuperconducting RF Cavities Development at Argonne National Laboratory
, The University of Chicago Superconducting RF Cavities Development at Argonne National Laboratory Sang-hoon Kim on behalf of Linac Development Group in Physics Division at Argonne National Laboratory
More information5.5 SNS Superconducting Linac
JP0150514 ICANS - XV 15 th Meeting of the International Collaboration on Advanced Neutron Sources November 6-9, 2000 Tsukuba, Japan Ronald M. Sundelin Jefferson Lab* 5.5 SNS Superconducting Linac 12000
More informationAurélien Ponton. First Considerations for the Design of the ESS Cryo-Modules
Accelerator Division ESS AD Technical Note ESS/AD/0001 Aurélien Ponton First Considerations for the Design of the ESS Cryo-Modules 16 March 2010 First considerations for the design of the ESS cryo-modules
More informationRF Design of Normal Conducting Deflecting Cavity
RF Design of Normal Conducting Deflecting Cavity Valery Dolgashev (SLAC), Geoff Waldschmidt, Ali Nassiri (Argonne National Laboratory, Advanced Photon Source) 48th ICFA Advanced Beam Dynamics Workshop
More informationJIJL NIOBIUM QUARTER-WAVE CAVITY FOR THE NEW DEEM BOOSTER LINAC
NOBUM QUARTER-WAVE CAVTY FOR THE NEW DEEM BOOSTER LNAC e o d f - g? o S ~ - -293 K. W. Shepard, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, L 60439 USA, and A. Roy, P. N. Potukuchi, Nuclear
More informationReport of working group 5
Report of working group 5 Materials Cavity design Cavity Fabrication Preparatioin & Testing Power coupler HOM coupler Beam line absorber Tuner Fundamental R&D items Most important R&D items 500 GeV parameters
More informationSUPERCONDUCTING CAVITIES AND CRYOMODULES FOR PROTON AND DEUTERON LINACS
Proceedings of LINAC2014, Geneva, Switzerland THIOA04 SUPERCONDUCTING CAVITIES AND CRYOMODULES FOR PROTON AND DEUTERON LINACS G. Devanz, CEA-Irfu CEA-Saclay, Gif-sur-Yvette 91191, France Abstract We review
More informationHigh acceleration gradient. Critical applications: Linear colliders e.g. ILC X-ray FELs e.g. DESY XFEL
High acceleration gradient Critical applications: Linear colliders e.g. ILC X-ray FELs e.g. DESY XFEL Critical points The physical limitation of a SC resonator is given by the requirement that the RF magnetic
More informationIJSRD - International Journal for Scientific Research & Development Vol. 2, Issue 04, 2014 ISSN (online):
IJSRD - International Journal for Scientific Research & Development Vol. 2, Issue 04, 2014 ISSN (online): 2321-0613 Conditioning Monitoring of Transformer Using Sweep Frequency Response for Winding Deformation
More informationUltrasonic Cleaning: How to select the best option
Ultrasonic Cleaning: How to select the best option Marais 36 Phone/Fax: +41- (0)-32-9314045 2400, Le Locle email: mpi@mpi-ultrasonics.com Switzerland http://www.mpi-ultrasonics.com mpi@bluewin.ch http://mastersonic.com
More informationSUPERCONDUCTING RESONATORS DEVELOPMENT FOR THE FRIB AND ReA LINACS AT MSU: RECENT ACHIEVEMENTS AND FUTURE GOALS
SUPERCONDUCTING RESONATORS DEVELOPMENT FOR THE FRIB AND ReA LINACS AT MSU: RECENT ACHIEVEMENTS AND FUTURE GOALS A. Facco #+, E. Bernard, J. Binkowski, J. Crisp, C. Compton, L. Dubbs, K. Elliott, L. Harle,
More informationSTATUS OF THE ILC CRAB CAVITY DEVELOPMENT
STATUS OF THE ILC CRAB CAVITY DEVELOPMENT SLAC-PUB-4645 G. Burt, A. Dexter, Cockcroft Institute, Lancaster University, LA 4YR, UK C. Beard, P. Goudket, P. McIntosh, ASTeC, STFC, Daresbury laboratories,
More informationResonant Frequency Analysis of the Diaphragm in an Automotive Electric Horn
Resonant Frequency Analysis of the Diaphragm in an Automotive Electric Horn R K Pradeep, S Sriram, S Premnath Department of Mechanical Engineering, PSG College of Technology, Coimbatore, India 641004 Abstract
More information